When running graphics/1_screen_resolution_xxx case on HP Z820-2, the display resolution is correct (1920x1080) but test case fail. This issue also can be reproduced on Z230-2 test. Please refer attached screenshot.
test result submission https://certification.canonical.com/hardware/201407-15335/submission/101033/
Test image stella-datong140729-trusty-amd64-20140925-3
BIOS J63 v03.69
kernel 3.13.0-34-generic
Plainbox version
ii plainbox 0.13.1~ppa~ubuntu14.04.1 all toolkit for software and hardware integration testing
ii plainbox-glmark2-es2-meta 0.8~ppa~ubuntu14.04.1 amd64 metapackage to selectively install glmark2-es2
ii plainbox-insecure-policy 0.13.1~ppa~ubuntu14.04.1 all policykit policy required to use plainbox (insecure version)
ii plainbox-provider-certification-client 0.8~ppa~ubuntu14.04.1 all Client Certification
ii plainbox-provider-checkbox 0.12~ppa2~ubuntu14.04.1 amd64 CheckBox provider for PlainBox
ii plainbox-provider-oem 0.1ubuntu28 all plainbox oem provider
ii plainbox-provider-oem-stella 0.1ubuntu28 all plainbox oem provider for stella
ii plainbox-provider-resource-generic 0.10~ppa~ubuntu14.04.1 amd64 CheckBox generic resource jobs provider
ii python3-plainbox 0.13.1~ppa~ubuntu14.04.1 all toolkit for software and hardware testing (python3 module)
screenshot